package com.xiaohu.demo.controller.image;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.xiaohu.demo.utils.color.ColorUtils;
import com.xiaohu.demo.utils.result.RequestResult;
import com.xiaohu.demo.utils.spring.SpringUtils;

@Controller
@RequestMapping("image")
public class ImageController {
	@RequestMapping("/authCode")
    public void getAuthCode(HttpServletRequest request, HttpServletResponse response,HttpSession session) throws IOException {
        int width = 63;
        int height = 37;
        Random random = new Random();
        //设置response头信息
        //禁止缓存
        response.setHeader("Pragma", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);

        //生成缓冲区image类
        BufferedImage image = new BufferedImage(width, height, 1);
        //产生image类的Graphics用于绘制操作
        Graphics g = image.getGraphics();
        //Graphics类的样式
        g.setColor(ColorUtils.getRandColor(200, 250));
        g.setFont(new Font("Times New Roman",0,28));
        g.fillRect(0, 0, width, height);
        //绘制干扰线
        for(int i=0;i<40;i++){
            g.setColor(ColorUtils.getRandColor(130, 200));
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int x1 = random.nextInt(12);
            int y1 = random.nextInt(12);
            g.drawLine(x, y, x + x1, y + y1);
        }

        //绘制字符
        String strCode = "";
        for(int i=0;i<4;i++){
            String rand = String.valueOf(random.nextInt(10));
            strCode = strCode + rand;
            g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
//            g.setColor(ColorUtils.getRandColor(200, 250));
            g.drawString(rand, 13*i+6, 28);
        }
        //将字符保存到session中用于前端的验证
        session.setAttribute("strCode", strCode);
        g.dispose();

        ImageIO.write(image, "JPEG", response.getOutputStream());
        response.getOutputStream().flush();

    }
	
	
	@RequestMapping("/submitCode")
	@ResponseBody
	public RequestResult submitCode(HttpServletRequest request) {
		String code = request.getParameter("code");
		String sessionCode = (String) SpringUtils.getSession().getAttribute("strCode");
		if(code.equals(sessionCode)) {
			return new RequestResult("验证成功","200",null,true);
		}else {
			return new RequestResult("验证失败","-1",null,false);
		}
	}
}
